You asked if anyone has gone through separation. I have, and that's my experience.
I could have just replied "I have" and never posted another word. What would be the point?
Nearly two years ago, I came on this thread, posting about my wife leaving me. Some people blew sunshine up my butt, some said they would pray, a couple told the truth. I thought the ones telling the truth were complete jerks. Now I wonder what the ones who prayed, were praying for. I know now, God doesn't change anyone's mind.... he refuses to.
My experience with separation is mine, and true. The only people I have ever seen reconcile a broken marriage, is in movies. My experience has left me not trusting a word that comes out a woman's mouth. Maybe one will change my mind one day, I doubt it.
Everyday, someone starts a thread on their broken marriage. I have yet to read anyone get their wife back after she leaves.
I thought I could do the love dare, read a dozen Christian books, see a marriage counselor alone, cause she refused to go, and pray my marriage back together. I begged, pleaded, bought flowers and presents.... nothing. She used all that to her advantage, to get me to agree to her terms. Now I have to pay her a portion of my salary and my future retirement, until the day I die. All this while another man lays with her each night.
Mental illness, yeah, mine had that too. And it won't make a difference to the court that divides up your money.
You don't have to stop loving her, but you have to let go. My best advice.... get a lawyer.